﻿// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System.Collections.Generic;

using Nova.CodeDOM;

namespace Nova.UI
{
    /// <summary>
    /// The view model for a <see cref="CodeDOM.Dot"/>.
    /// </summary>
    public class DotVM : BinaryOperatorVM
    {
        #region /* STATICS */

        internal static void AddViewModelMapping()
        {
            CreateViewModel.Add(typeof(Dot),
                delegate(CodeObject codeObject, bool isDescription, Dictionary<CodeObject, CodeObjectVM> dictionary) { return new DotVM((Dot)codeObject, dictionary); });
        }

        #endregion

        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create a view model instance for the specified <see cref="CodeDOM.Dot"/>.
        /// </summary>
        public DotVM(Dot dot, Dictionary<CodeObject, CodeObjectVM> dictionary)
            : base(dot, dictionary)
        { }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The underlying <see cref="CodeDOM.Dot"/> model.
        /// </summary>
        public Dot Dot
        {
            get { return (Dot)CodeObject; }
        }

        #endregion

        #region /* METHODS */

        /// <summary>
        /// Get the <see cref="ExpressionVM"/> on the right of the right-most <see cref="LookupVM"/> or <see cref="DotVM"/> (bypass any '::' and '.' prefixes).
        /// </summary>
        public override ExpressionVM SkipPrefixes()
        {
            return Right.SkipPrefixes();
        }

        #endregion

        #region /* RENDERING */

        protected internal override bool HasBorder()
        {
            // Ignore a border request if the '.' starts on a new line (otherwise things get ugly)
            return (CodeRenderer.MaximizeBorders && !(_leftVM != null && _leftVM.IsFirstOnLine));
        }

        public override void RenderExpression(CodeRenderer renderer, RenderFlags flags)
        {
            // If we're rendering a Description, turn off some flags for the children of the Dot
            RenderFlags passFlags = (flags & (RenderFlags.PassMask & ~(RenderFlags.Description | RenderFlags.ShowParentTypes)));
            if (_leftVM != null)
                _leftVM.Render(renderer, passFlags | RenderFlags.IsPrefix | RenderFlags.NoSpaceSuffix);
            RenderDot(renderer, this);
            if (_rightVM != null)
                _rightVM.Render(renderer, passFlags | RenderFlags.HasDotPrefix | (flags & RenderFlags.Attribute));  // Special case - allow the Attribute flag to pass
        }

        public static void RenderDot(CodeRenderer renderer, CodeObjectVM tag)
        {
            renderer.RenderText(Dot.ParseToken, IDENTIFIER_BRUSH, tag);
        }

        #endregion
    }
}
